I specifically bought the 990FX because it was supposed to handle 1866 memory, with AM3+ CPU, I have the AMD FX 8150.

According to manufacturer, I have the correct 1866 memory for the mobo, but it will not operate over 1366 on memory.

Is there a switch on the mobo that I need to change?
If so, I can't find it.

Take care, and thanx in advance for any help............

terrybear

November 10, 2011 04:05 PM

Try shifting the moduals into the other 2 ram slots, i found on my board i needed to put my ram in slots 1-2 insted of 3-4 to get the higher speeds. Might be the case with you as well.

lechumbl

November 10, 2011 04:12 PM

Hi teddybear,

My bad, I didn't mention that all 4 slots are filled, one set is in slots 1 and 3, and the other is in slots 2 and 4.
I am running 16 GB of memory.
Sorry!

Take care........

techman95

November 10, 2011 05:00 PM

did you change it to 1866 in the bios? because i run 1600mhz ram on mine and had to change it from 1300 to 1600 manually. and im pretty sure its for all boards right now. and also if you've done that already have you updated your bios to the latest one from asus?

Soultribunal

November 10, 2011 05:01 PM

You might have to bump up your voltages because you are running 4 modules in the board for those speeds.
I would start increasing it a bit and bumping the vtt as well.

ST

lechumbl

November 10, 2011 05:07 PM

Hi techman95,
I manually changed it to 1866 in BIOS and it would not boot.
I have the latest BIOS on the board now.
The other only one out there is a Beta one, don't want that yet.

Hi Soultribunal,
Which voltages, besides the VTT need to be increased.
Right now, the settings for voltages are set to "auto".

Take care............

Soultribunal

November 10, 2011 05:52 PM

First, which RAM kit are you using. That will help me research its specs.

Secondly, you will have to manually adjust the RAM voltage itself at times when running 4 sticks so we are gonna have to change AUTO on that to a manual number. But I want to know which kit you have first.

Okay, you will almost certainly need to Set your Voltage manually to 1.65v for that kit. I am 90% sure that your ASUS board is only running 1.5v into it right now (Which is nominal V if you have an AM3 chip in there).

Check that out, and set it manually.
As well, if you notice the timings are really odd for the Memory to get that Speed.
Set your timings manually as well for 9-11-9-27

-ST

lechumbl

November 10, 2011 06:37 PM

Hi again,

Great, will try later, as my wife wants to go out for dinner, it is 5:30 here, and we are hungry.